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Giorgio Calucci

Publications and source records attributed to Giorgio Calucci.

20 records · Page 2Linked to original sources

Self-Similarity of the Negative Binomial Multiplicity Distributions

The negative binomial distribution is self similar: If the spectrum over the whole rapidity range gives rise to a negative binomial, in absence of correlation and if the source is unique, also a partial range in rapidity gives rise to the same distribution. The property is not seen in experimental data, which are rather consistent with the presence of a number of independent sources. When multiplicities are very large self similarity might be used to isolate individual sources is a complex production process.

hep-ph↗

Minijets and the Two-Body Parton Correlation

A large number of double parton scatterings have been recently measured by CDF. The double parton scattering process measures $σ_{eff}$, a non perturbative quantity related to the hadronic transverse size and with the dimensions of a cross section. The actual value measured by CDF is considerably smaller as compared with the naive expectation, namely the value of the inelastic non diffractive cross section. The small value of $σ_{eff}$ may be an effect of the hadron structure in transverse plane. We discuss the problem by taking into account, at all orders, the two-body parton correlations in the many-body parton distributions.

hep-ph↗